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====== MAX31865PMB1 RTD-to-digital converter PMOD User Guide ======

The [[ADI>MAX31865PMB1]] peripheral module provides the necessary hardware to interface the MAX31865 RTD-to-digital converter to any system that utilizes Pmod compatible expansion ports configurable for SPI communication. The IC is an easy-to-use resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs). This module is set up to operate with a PT100 platinum RTD.

{{ :resources:eval:user-guides:circuits-from-the-lab:max31865:max31865_board.png?nolink&400 |}}

===== Hardware =====
==== Power Supply Requirements ====

When using the MAX31865 PMOD board, the 3.3 V power comes directly from the host board it is connected to.  The power from the host is generally capable of providing up to 100 mA at 3.3 V; but for complete PMOD power specifications, please click[[https://www.digilentinc.com/Pmods/Digilent-Pmod_%20Interface_Specification.pdf|here]].
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==== RTD Connector ====
Connector CON1 provides connection to the IC pins, as
follows:
  * Connector CON1 pin 1 connects to FORCE+ and FORCE2 (pins 5 and 6) of the IC.
  * Connector CON1 pin 2 connects to RTDIN+ (pin 7) of the IC.
  * Connector CON1 pin 3 connects to RTDIN- (pin 8) of the IC.
  * Connector CON1 pin 4 connects to FORCE- (pin 9) of the IC
{{ :resources:eval:user-guides:circuits-from-the-lab:max31865:5-5-2023_10-07-41_am.png?nolink&650 |}}
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==== RTD configuration ====
Two jumpers at J2 are provided to select either 2-wire or 3-wire RTD configuration. For 2-wire RTD, install both jumpers, from 1-2 and 3-4. For 3-wire RTD, install jumper from 3-4 only.
{{ :resources:eval:user-guides:circuits-from-the-lab:max31865:5-5-2023_10-09-41_am.png?nolink&250 |}}
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==== Digital Interface (PMOD) ====

The PMOD interface is a series of standardized digital interfaces for various digital communication protocols such as SPI, I2C, and UART.  These interface types were standardized by Digilent, which is now a division of National Instruments.  Complete details on the PMOD specification can be found [[https://www.digilentinc.com/Pmods/Digilent-Pmod_%20Interface_Specification.pdf|here]].

The MAX31865PMB1 peripheral module can plug directly into a Pmod-compatible port (configured for SPI) through connector J1. Connector J1 provides a connection of the module to the host. The pin functions and pin assignments adhere to the Pmod standard recommended by Digilent.

{{ :resources:eval:user-guides:circuits-from-the-lab:max31865:max31865_spi.png?nolink&600 |}}
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===== Device Driver Support =====

There are two device driver solutions that are provided for controlling the **MAX31865PMB1**:
  - **MAX31865 no-OS Driver**
      * The **[[:resources:tools-software:uc-drivers:max31865|MAX31865 no-OS driver]]** is used in bare-metal applications, typically running on low-power, embedded microcontrollers. 
  - **MAX31865 Linux Driver**
      * The **[[linux.github>master/drivers/iio/temperature/max31865.c| MAX31865 Linux driver]]** is used in applications running the Linux operating system, typically on larger processors and SoC devices.
      * The MAX31865 Linux driver uses the Industrial Input/Output (IIO) framework, greatly simplifying the development of application code via the cross-platform Libiio library, which is written in C and includes bindings for Python, MATLAB, C#, and other languages. Application code can run directly on the platform board, communicating with the device over the local backend, or from a remote host over the network or USB backends.\\

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===== More information and Useful links =====
  * [[ADI>MAX31865|MAX31865 Product Page]]
  * [[adi>en/design-center/evaluation-hardware-and-software/evaluation-boards-kits/max31865pmb1.html|MAX31865PMB1 Product Page]]
  * [[repo>no-OS/tree/master/drivers/temperature/max31865pmb1|MAX31865PMB1 No-OS Driver]]
  * [[linux.github>master/drivers/iio/temperature/max31865.c| MAX31865 Linux driver]]

===== Schematics, PCB Layout, Bill of Materials =====
<WRAP round 80% download>
  * [[adi>media/en/technical-documentation/data-sheets/MAX31865PMB1.pdf|MAX31865PMB1 Datasheet]]
</WRAP>

===== Additional Information =====
  * [[https://github.com/analogdevicesinc/pyadi-iio|pyADI-IIO]]
  * [[:resources:tools-software:linux-software:pyadi-iio|PyADI-IIO Installation Guide]]
  * [[:resources:tools-software:linux-software:iio_oscilloscope|IIO Oscilloscope Installation Guide]]
  * [[:resources:tools-software:linux-software:kuiper-linux|Kuiper Linux]]

=====Registration===== 
<WRAP round tip 80% >
Receive software update notifications, documentation updates, view the latest videos, and more when you register your hardware.  [[reg>MAX31865PMB1?&v=Rev A|Register]] to receive all these great benefits and more!</WRAP>
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